[Ionut]- Rework RenderTarget class— RTAttachment now deal with textures directly— RT size needs to be specified upfront- Application class is no longer a Singleton but passed around in the PlatformContext

[IonutCava]- Fixed viewport alignment issue- Added per-player RenderTargets (added index support to GFXRTPool)- Initial implementation of per-player cameras— Removed defaultCamera— Scenes now use a baseCamera as a template for new player cameras